I finished my short file for a homework assignment which uses IO.popen("command").readlines to grab the STDOUT of that command. However, I need to write a shell script to wrap my ruby file in. No problem, but somehow putting it in the shell script makes readlines hang.
ruby script.rb foo example > example.out
this works
script.sh foo example >example.out
this hangs on readlines. ruby script.rb is all that script.sh contains.
Looks like you forgot to pass your arguments to the ruby command. You may also be failing to specify an interpreter
script.sh
#!/bin/sh
ruby script.rb "$@"
Alternatively you could just add #!/usr/bin/ruby to the top of script.rb and make it executable (chmod +x script.rb). It's not a shell script. But it's generally the preferred way of executing a script in an interpretive language.
Once that's done you can run it with
./script.rb